A version of this story first appeared in CNN Business’ Before the Bell newsletter. Not a subscriber? You can sign up right here. You can listen to an audio version of the newsletter by clicking the same link. New York CNN Business  —  American shoppers just keep on spending, lending vital support to the economy. The question is: How long will it last? What’s happening: Americans appear to be indulging in a healthy dose of retail therapy despite stubbornly high inflation and the possibility of a recession ahead. Preliminary Black Friday and Cyber Monday numbers point to a strong holiday season, despite earlier concerns that it could turn out to be…